I am a novice in mobile device.I am looking for a most recent UMPC or PDA model having fast CPU but small display (less than 9").I know this is the silly question but frankly I have no feeling the current CPU performance comparing to my dual core PC.Acquiring and analyzing data in realtime is developing under NI-Labview.Is there high performance CPU in the UMPC or PDA?Or could you estimate how to matching CPU performance of the mobile device to that of PC?

High performance CPU and UMPC are almost mutually exclusive. The issues are heat dissipation for fast CPUs and cost. Finding something with dual core (Intel Core2 Duo) performance isn't going to happen, as most have ultra low voltage CPUs and typically Intel Atom CPUs that offer enough speed to do MS Office, web browsing and email but feel somewhat slow when using more demanding applications.

In terms of benchmarks, UMPCs with Atom class CPUs are half the speed of a midrange Intel Core2 Duo.

PDAs don't run full Windows OS (or Mac OS or non-embedded Linux OS), so it sounds like they wouldn't meet your needs.

Some of the faster UMPCs under 9" would be the discontinued Sony Vaio UX380, the Fujitsu U820 and the OQO model 02.